Compare 1281 vs 1291
| Property | 1281 | 1291 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 31 × 71 × 611 | 12911 |
| Prime factorization | 3 × 7 × 61 | 1291 |
| Divisors count | 8 | 2 |
| Divisors | 1, 3, 7, 21, 61, 183, 427, 1281 | 1, 1291 |
| Number of properties | 0 | 9 |
| Additive primes | 113th | |
| Chen primes | 137th | |
| Harmonic primes | 73rd | |
| Long primes | 80th | |
| Lucky primes | 54th | |
| Primes | 210th | |
| Sexy primes (1st member) | 91st | |
| Sexy prime triplets (1st member) | 35th | |
| Twin primes (2nd member) | 44th | |
| Roman numberals | MCCLXXXI | MCCXCI |
| Base 2 | 101000000012 | 101000010112 |
| Base 3 | 12021103 | 12022113 |
| Base 4 | 1100014 | 1100234 |
| Base 5 | 201115 | 201315 |
| Base 6 | 55336 | 55516 |
| Base 7 | 35107 | 35237 |
| Base 8 | 24018 | 24138 |
| Base 9 | 16739 | 16849 |
| Base 10 | 128110 | 129110 |
| Base 11 | a6511 | a7411 |
| Base 12 | 8a912 | 8b712 |
| Base 13 | 77713 | 78413 |
| Base 14 | 67714 | 68314 |
| Base 15 | 5a615 | 5b115 |
| Base 16 | 50116 | 50b16 |